Tire tread wear indicator



FIG. 1 is a side perspective view of a tire tread wear indicator showing our new design;

FIG. 2 is an enlarged fragmentary side perspective view thereof; and,

FIG. 3 is an enlarged side elevational view thereof.

The broken lines defining the tread pattern depict environmental subject matter that forms no part of the claimed design. The dash-dot-dot line in FIG. 1 represents the boundary of the enlarged fragmentary side perspective view shown in FIG. 2, and the dash-dot-dot line in FIG. 2 represents the boundary of the enlarged fragmentary side perspective view taken from FIG. 1. 

CLAIM The ornamental design for a tire tread wear indicator, as shown and described. 